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Welding process acceptability requirements

发布人:管理员 发布时间:2018-04-16

Welding
1.The nature of the welding process determines that an acceptable connection will exhibit the same characteristics for all three levels;
2.Unacceptable connections are likely to be rejected for all three levels;
3.The type of welding process used has been specified in the appropriate description of the connection requirements;
4.Whichever of the following welding methods is used, the connection requirements apply:
▸ Soldering Iron
▸ Impedance Welding Equipment
▸ Wave or Wafer Welding
▸ Reflow soldering
▸ Through Hole Reflow Welding
5.Exceptionally, there are some special welding surface treatments that require the establishment of different special acceptance conditions, which are not shown in the IPC-A-610F.
▸ Immersion Tin
▸ Palladium
▸ Gold
Such special conditions should be based on design, process capability and performance requirements;
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6.The main difference between the process of using tin-lead alloys and the solder connections produced by using lead-free alloys is:
▸ The appearance of solder joints
▸ This standard provides visual inspection requirements for tin-lead and lead-free connections;
▸ The legend that specifically refers to the lead-free connection will be identified by the symbol in Figure 5-3.
7. Lead-free alloys are more likely to show:
▸ Rough surface (grain or gray)
▸ Larger wetting angle
▸ Other requirements for solder filling are the same
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8. Typical tin-lead connections
▸ Satin-like moist surface
▸ Smooth appearance
▸ Present lubrication
▸ Concave surface formed between objects to be welded
▸ High-temperature solder, may be dry-like
▸ Modify (rework) must be judged to prevent other problems
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